<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>
<script type="text/javascript">
    'use strict';
    let [x,y,[s],[[f]]] = [1,2,[3],[[4]]];
    console.log(x, y, s, f);
</script>